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Cemetery Perpetual Care Trust Investments (Cost and fair market values associated with the trust investments held in perpetual care trust funds) (Details) - Perpetual Care Trust Investments - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Cemetery perpetual care investments $ (64,047) $ (44,071)
Market value as a percentage of cost 104.90% 90.80%
Cash and money market accounts | Fair Value, Level 1    
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 4,624 $ 11,144
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Market Value 4,624 11,144
Foreign debt | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 4,200 2,872
Unrealized Gains 238 27
Unrealized Losses (175) (385)
Fair Market Value 4,263 2,514
Preferred stock | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 11,658 9,956
Unrealized Gains 802 227
Unrealized Losses (534) (730)
Fair Market Value 11,926 9,453
Preferred stock | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 10,782 8,141
Unrealized Gains 666 37
Unrealized Losses (106) (820)
Fair Market Value 11,342 7,358
Mortgage-backed securities | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 324 417
Unrealized Gains 0 101
Unrealized Losses (71) (9)
Fair Market Value 253 509
Common stock | Fair Value, Level 1    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 21,594 15,562
Unrealized Gains 3,399 542
Unrealized Losses (1,911) (3,395)
Fair Market Value 23,082 12,709
Equity Securities [Member] | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 233  
Unrealized Gains 146  
Unrealized Losses (1)  
Fair Market Value 378  
Fixed income | Fair Value, Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 7,156  
Unrealized Gains 618  
Unrealized Losses (107)  
Fair Market Value 7,667  
Trust securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 60,571 48,092
Unrealized Gains 5,869 934
Unrealized Losses (2,905) (5,339)
Fair Market Value 63,535 43,687
Accrued investment income    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 512 384
Fair Market Value $ 512 $ 384